Earlier quoted context omitted.
I think in your scenario, a good fit would be a cigarette case that you'd keep in your front pocket. Eurpean here. I was shocked to learn many USAian men keep their wallet in the back pocket. How do you sit on that?
I have a money clip, a smart phone and keys. Phone needs to be in a front pocket so that I don't sit on it and break it. Keys need to be in my front right pocket so that they are accessible and I do not sit on them and never sit again. Thus my billfold must go in one of my rear pockets.
The keys and money clip are distinct enough that I have no problem pulling out the right thing. And the keys are not going to damage the money clip like they would damage the phone.